Fix docs coverage and add tests coverage

Author: khiga8

.github/workflows/ci.yml

@@ -55,3 +55,21 @@ jobs:
         bundle config path vendor/bundle
         bundle install --jobs 4 --retry 3
         bundle exec rake docs:coverage
+  tests-coverage:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: Setup Ruby
+      uses: actions/setup-ruby@v1
+      with:
+        ruby-version: 3.0.x
+    - uses: actions/cache@v2
+      with:
+        path: vendor/bundle
+        key: gems-build-rails-main-ruby-2.7.x-${{ hashFiles('**/Gemfile.lock') }}
+    - name: Verify docs coverage
+      run: |
+        gem install bundler:2.2.32
+        bundle config path vendor/bundle
+        bundle install --jobs 4 --retry 3
+        bundle exec rake tests:coverage

docs/rules/accessibility/avoid-both-disabled-and-aria-disabled.md

@@ -4,8 +4,7 @@ namespace :docs do
   task :coverage do
     require "erb_lint/all"
     require "erblint-github/linters"
-
-    Dir[File.join(__dir__, "linters", "github/**/*.rb")].sort.each do |file|
+    Dir[File.join("lib", "erblint-github", "linters", "github/**/*.rb")].sort.each do |file|
       rule_documentation_path = file
                                 .gsub("#{__dir__}linters/github/", "docs/rules/")
                                 .gsub(".rb", ".md")

lib/tasks/docs.rake

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+namespace :tests do
+  task :coverage do
+    require "erb_lint/all"
+    require "erblint-github/linters"
+
+    Dir[File.join("lib", "erblint-github", "linters", "github/**/*.rb")].sort.each do |file|
+      test_path = file.gsub("lib/erblint-github/linters/github/", "test/linters/").gsub(".rb", "_test.rb")
+      raise "Missing test. Please add test in #{test_path}" unless File.file?(test_path.to_s)
+    end
+    puts "All rules have test coverage."
+  end
+end